Pitman ring



April 23, 1929. T. H. EUBANKS PITMAN RING Filed Nov. 9, 1926 PatentedApr. 23, 1929.

u i ITED *STATES 'rnoivms n. EUBANKS, or Mexm, TEXAS.

Application filed November rihis invention relates to pitmau rings andmore particularly to a device of this character forinaintaining thepitinen of well drilling apparatus in position upon the wrist pinsthereof.

An important object of be readily applied and removed and when appliedwill very firmly lock the pitman upon the wrist pin and which is capableof being very readily removed, 'when desired.

A further object of the invention is to provide a device of thischaracter,which may be readily and cheaply manufactured, which will bedurable and eificient in service and a general improvement in the art.

These and other objects l attain by the construction shown in theaccoii'ipanying drawing, wherein for the purpose of illustration isshown a preferredembodiment of my invention and wherein r- Figurc 1 is aside elevation showing a pitman ring constructed in accordance with myinvention applied to the crank pin of well drilling apparatus; f

Figure 2 is a front elevation partially in section of the ringunapplied;

Figure 3 is a section on the line B-f-S of Figure 2; I j

Figure i is an inside elevation of the fragment of the ring showing therecess within which the pin is located;

Figure 5 is a fragmentary elevation of the ring at the opening providedfor the pin.`

Referring novvvmore particularly to the drawings, the numeral 10indicates a ring or.y

collar adapted for engagement with the wrist pin and having` a centralopening` 11 in which the wrist pin iits neatly. rThis ring is providedwith diametrically extending aligned. bores 12 and 13. rihebore 13 hasits outer end counter-bored, as indicated at 1li, and its inner end incommunication with a recess 15 formed in the inner face of the ring.A'ihe bores 12 and 13 provide a mounting for the ends of a pin 16, oneend of which has a head 17. Ad- `iacent this head, the pin 16 hasprojecting from vthe side face a lug 18, this lug being spaced from theadjacent face of the head a distance slightly greater than the distancebetween the outer face of the ring v10 and the adjacent wall oftherecess 15. The wall of the bore 13 and of its enlargement 11i are formedwith a channel 19 permitting the pasthe invention is to provide a deviceof this character winch may 9, 192s. sei-iai- No. 147,287.

sage of this lug from the outer face of the ring 10 to the recess 15..El hen positioned within the recess 15, the pin 1G may be rol tated toalign this lug with a. socket formed in the face of the'wall of therecess or socket 20 for its reception. Between the head 111 and the baseof the counterbore, a spring 21 surrounds the pin and acts to constantlyurge the pin outwardly, so that this pin will be held in the recess 2Oand may only be aligned with the channel 19 by forcibly shifting the pin16 lon.- gitudinally and rotating the same while shifted inwardly. y

i twill be obvious that with this pin passed through a lbore 22 formedin theA wrist pin 23 for its reception, the collar 10 and accordingly apitman 24: retained in position by the collar will be firmly heldagainst longitudinal movement upon the wrist pin.

Since the construction hereinbefore set forth is capable of a certainrange of change and modification without materially departing from thespirit of the invention, I do not limit myself to such specificstructure except as hereinafter claimed.

l claim :d in combination with a wrist pin Ahaving a pin receiving bore,aL collar applied thereto and having diametrically opposed rboresaligned with'the bore of the wrist pin, aV

locking pin extending through the bores of the collar and engaged in thebore of the wrist pin, the collar at the inner end of one of the boresthereof `having a recess enlarging theloore, there being a socket at theinner end of said recess, the collar at the outerend `of said borehaving a further recess, the wall of said bore having a longitudinalchannel circumferentially spaced from the socket at the inner end of thefirst named recess, the locking pin having a lug passable through saidchannel for engagement in the first named recess and alignable with thesocket by rotation of the locking pin said lug being disposed in saidAsocket, the outer endvof the locking pin having ahead, and a springsurrounding the locking pin between the lug` and head and-seated in theIlast named recess and constantly urging the head of the lockingpinoutwardly;

In testimony whereof I hereunto a'iiix my signature.

rnoMA-s n. nUBANKs.

